Paper and pasteboard machine.



N. PEDERSEN.

PAPER AND PASTEBOARD MACHINE.

-APPLIGATION TILED MAY 6, 1911.

Patented m. M, 1913.

5 midi v aag ll olicution filed To (/Z] 'w/am/i mug, con-c Be it knownthat such will enableothers skilled in the o which it appertalns to makeuse i hine calied the pr. generally cons sts of press-rolls zi et paper,from first part c. i ne, isjirans 5e ed with n woolen felt which passeswith th nsper between each pair of press rolls.

6 The invention consists in heating the 1121;) or paper after it haspassed 'eaiween he first two pairs of press rolls and before it reachesthe last pair of rolis, the eating bcin effected preferably by passingtue sheet over a drying cylinder. This heat 1 reduces the viscosity ofthe water contnined in the slices so that the action of the his pair ofpress rolls is greatly enhanced, ant the amount of steam necessary forthe subsequent drying operation is greatly re duced owing to the factthat the sheet on entering the drier has a much lower content of "waterthan when it; is not subjected to the preliminary heating.

In 'the accompanying drawing, I have illustrated diagrammatically thesecond or press-part, andthe third part or drier of a paper machine.

In said drawing 1, indicates the Web or sheet or" soft Wet paper, 2, 2,the first two sets of press-rolls from which the Web passes onto thefirst drying cylinder 3 of the series of cylinders which constitute thedrier or third part of the paper machine. The rela- Sseci cation ofLetters Patent.

the posiiion of the first cylinder 3 to the second and th'rd pairs ofpress-rolls, is such that the sheet is caused to pass almost entirelyaround said cylinder, thus insuring on efiectii'c heating of the sheetbefore it passes from the cylinder 3 and between the latter or thirdpair of press rolls 2 from which letter M. d sheet piss-es around thereincini q cylinders 3 of the drier usual.

it. will he rcadiiy seen that applicants method may be carried outWithout any great alterations of the Well known forms (if papermachines.

She obg'ect of the invention could not be attained by substituting forone off the coid rolls, a heated roll or cylinder, because the timeduring which the sheet is passing be tween the press rolls too short toproperly heat. the sheet. U

rapidly running paper machines 1 e heating could be expedited by heatingthe felt which runs with the sheet through iie press part of themachine.

I claim:

1. The method of. making paoer pulp and paper, which consists in heatinga Wet sheet of pulp or paper, to reduce the viscosity of the Watertherein and thereby facilitate the expulsion of the Water therz from,and passing the heated sheet through the last Wet press or presses.

2. The met-hodiof making paper pulp and paper, which consists in heatinga Wet sheet of pulp or paper, to reduce the viscosity of the Watertherein and thereby facilitate the expulsion of the water therefrom,passing the heated sheet through the last wet press or presses andfinally drying the heated pressed sheet.

3. The method of making paper pulp and thick paper, which consists inheatinge Wet sheet of pulp or paper by passing it over a dryingcylinder, to reduce the viscosity of the water in the sheet and therebyfacilitate the expulsion of the water from the latter, and passing theheated sheet through the last vc-t press or presses.

4. The method of making paper pulp and thick paper, which consists inhcatin a wet sheet of pulp or paper, by passing 1t over Q oeoiee efirying cylinder, to re&uce the viscosity as my invention, I have signedmy nenne in of the1 Water in the fshelet and tlyareby lfecihpresence oftwo subscribing Witnesses. tete t e expu sion 0 t. e water roni t aslatfer, passing the heated sheet through the NILE PEDERSEN' 5 last Wetpress or presses and finally drying the heated pressed sheet.

In testimony that I claim the foregoing Witnesses AUG. ULSEN, HENRYBORDEN RICH.

